1. Мир на Земле (Mir na Zemle) - This is the most literal translation and is the most common way to say "Peace on Earth."
2. Мир Земле (Mir Zemle) - This is a more poetic and formal way to say "Peace on Earth." It emphasizes the earth as the recipient of peace.
Both translations are grammatically correct and convey the same general meaning. However, the first one is more common and neutral, while the second one is more poetic and formal.